Page 196 - SUBSEC October 2017_Neat
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(b) Figure 2 shows a simplified nitrogen cycle.
Nitrogen
Z V
Plants Animals
Nitrate
Ammonia
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W X
Nitrite
Figure 2. Simplified nitrogen cycle
http://www.hyndland-sec.glasgow.sch.uk/websites/schsecHyndland/UserFiles/image/Biology.jpg
(i) State the roles of Microorganisms V and Z in the nitrogen cycle.
V ............................................................................................................................
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X ............................................................................................................................
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[2 marks]
(ii) Many different relationships exist in ecosystems. With reference to named
organisms, explain how parasitism differs from mutualism.
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[4 marks]
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